There’s an expression for what you’re trying to do here - I think it’s called talking to a brick wall. You’re absolutely right, but they’re not going to listen to you. There is very little point in trying to win over Republicans and get them to vote for the Dem who runs. They aren’t going to, at least not in numbers that will make a lick of difference. Republicans know that humans are resistant to actually listening to the other side and taking their point of view instead; that’s why most of us don’t bother trying to convince anyone to change parties. Why bother? It’s not going to work! So effort is concentrated on getting more people to vote, period. You don’t need to win over any Democrats at all if you get those lazy 40% to get off their butts and put their money where their mouths are.
But I can’t tell you how many well-meaning Democrats have tried to “convince” me that I ought to swap aisles. Or less well meaning ones who imply - or outright declare - that only a moron would vote Republican. Yeah, I’m totally won over by people who tell me I’m dumb - what, am I supposed to vote for a Democrat to prove I’m not stupid? Like we’re six?
Anyway, the fact that there are “queer-hatin’ rednecks and wealthy bastards who are prejudiced against women and blacks” shouldn’t realistically be a problem for the Democrats. Those folks aren’t ever going to be won over anyway because they’re all Republicans, right? I mean, that’s what the Democrats keep telling us, so there must not be any people in their party who fulfill any of those stereotypes. No problems with Clinton or Obama getting the Democratic nomination, especially, given Republicans won’t be voting in that election at all.
If you can’t get either of them that far, I think the party might want to worry about the beam in their own eye before blaming all the prejudice in this country on us. Or create a conspiracy theory about Republicans in vast numbers temporarily changing their party affiliation just for the primaries to screw the Dems